CHT Plant Physiology & Growth 2

Question 1

Photoperiodism refers to a plant's response to:

Accepted Answer

The relative lengths of day and night

Answer

Photoperiodism is the physiological response to the duration of light and dark periods, controlling flowering time in many species.

Question 2

Which plant hormone is most associated with fruit ripening and senescence?

Accepted Answer

Ethylene

Answer

Ethylene is a gaseous hormone that triggers fruit ripening, leaf abscission, and flower senescence.

Question 3

What is the primary function of the phloem in vascular plants?

Accepted Answer

Transport of photosynthates (sugars) from leaves to other plant parts

Answer

Phloem conducts sugars and other organic compounds produced during photosynthesis from source tissues (leaves) to sink tissues (roots, fruits).

Question 4

A plant showing interveinal chlorosis on young leaves (veins remain green, tissue between yellows) most likely has a deficiency of:

Accepted Answer

Iron or Manganese

Answer

Iron and manganese are immobile nutrients needed for chlorophyll synthesis; deficiency appears first on young leaves with green veins and yellow tissue between them.

Question 5

Turgor pressure in plant cells is caused by:

Accepted Answer

Water entering the vacuole via osmosis, pushing against the cell wall

Answer

When water enters the central vacuole by osmosis, it creates turgor pressure that keeps non-woody plant cells rigid and maintains wilting resistance.

CHT - Certified Horticultural Technician Practice Test

CHT - Certified Horticultural Technician Practice Test

CHT Plant Physiology & Growth 2